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2QD Speed Controller
The 2QD is an ‘old’ product: it was about our simplest 2 quadrant controller, but for general use we would recommend our Porter 5 or Porter 10. This page is now for reference only. The 2QD Read More
- Current models
- 4QD
- Battery Contactor
- Adjustment for 48V
- Overheating in Boats
- Converting Parking Brake to Brake Light
- Disabling HPLO on Early 4QD Models
- Inhibit Ramp Modification [4QD series]
- Over voltage protection in the 4QD series
- Deadband Removal
- How to dismantle the 4QD series
- Testing the 4QD Base Board and MOSFETs
- Reverse Acceptance Threshold [RAT] Modification
- 4QD version history
- Current limit resistors
- Control Board Modification [Pre June 2010]
- Use with Tacho Feedback Board
- 4QD Series: Use with Series Wound Motors
- Forward / Off / Reverse Mode (4QD Series)
- Fault finding on the 4QD series
- Reversing Latch Modification [pre issue 16]
- Reverse Speed Modification [pre issue 17]
- Damage from a Reversed Battery (4QD Series)
- Mixing 4QD 150 / 200 / 300 series boards
- Inhibit
- Double Heading Pro-150 / 4QD series
- 4QD
- Pro-120 Mk2
- Current Limiting in the Pro-120 [and others]
- Pro-120 Mk2 History
- Pro-120 Key Components
- Modifying the Pro-120 for other voltages
- Pro-120 Modification to give Uni-Directional Control
- Pro-120 Robot Wars Version
- Pro-120 Ignition Options
- Earth Fuses: Why Do They Blow?
- Pro-120 Fault Finding Tips
- PRO-120 Ramp Reduction
- Fitting Expansion Connector
- PRO-120: Multiple Slaves
- Internal Power Supply and Protection Circuitry
- Wiring for Push Button Use
- Pro-120 Mk2
- Installation and Wiring Diagrams
- Controller Wiring Diagrams
- Double Heading Wiring Diagram [DNO]
- Driving the DNO by Raspberry Pi
- Pro-150 Basic Wiring Diagram
- Switching for Double Heading
- Collision Detection / Auto Reversing Circuits
- Typical Wiring for the PRO, DNO, VTX and NCC Controllers
- Wiring for Hand Control and Radio Control
- Wiring for Push Button Use
- UNI / Egret Wiring Options
- Double Heading Pro-150 / 4QD series
- Controller Wiring Diagrams
- Technical Background Information
- Batteries
- What is PWM
- Surge Currents
- Speed Stability
- Quadrants
- Heat
- Energy and Losses
- POT Dead Band
- Earth Track Fuse and Earth Loops
- Waveforms and Fault Finding
- Back EMF & Internal Resistance
- Guided tour articles
- Full Bridge
- Choosing a Controller [tour 1]
- What Does a Motor Speed Controller Do?
- Battery current and motor current [tour 4]
- Half bridge [tour 6]
- MOSFETs [tour 5]
- Switching frequency [tour 7]
- Regenerative braking [tour 8]
- Current limit [tour 9]
- Heatsinks [tour 11]
- Thermal shutdown [tour 10]
- Power down state [tour 13]
- Ramps [tour 14]
- Ignition [tour 12]
- Inhibit switch / footbrake - 4QD series only [tour 16]
- Forward / off / reverse mode or push-button operation [tour 17]
- Overvoltage protection [tour 18]
- Reversing [tour 15]
- Gain adjustment, pots, and inputs [tour 20]
- Joystick [aka wig-wag] [tour 21]
- Parking brake driver [tour 22]
- Brake light driver [tour 23]
- Pot fault detection [tour 24]
- High pot lockout HPLO [tour 25]
- Undervoltage cutback [tour 19]
- Main capacitor [tour 27]
- Radio control interface [tour 28]
- Reverse polarity protection [tour 26]
- Tacho generator feedback [tour 29]
- Voltage following [tour 30]
- Double heading [tour 31]
- Guided tour articles
- Motors
- Motors in Series and Parallel
- Motor Manufacturers
- Motor Matching
- Motor Examples
- Motor Types [detail]
- Motor Types Overview
- Motor Rating Background Information
- Old Controllers
- PCB numbers
- NCC
- Fitting Expansion Connector
- Ramp Timings (NCC)
- Damage from Reversed Batteries (NCC/VTX)
- Internal Power Supply and Protection Circuitry
- NCC Speed Controller
- VTX and NCC Operating Voltages
- NCC Circuit Description
- VTX / NCC Fault Finding
- NCC Mark 2 Issue Number History
- NCC Mark 1 Issue Number History
- NCC Key Components
- NCC Zener Diode Failure
- NCC
- PRO-120 Mark 1
- Pro 120 Mark 1 Speed Controller
- Current Limiting in the Pro-120 [and others]
- Pro-120 Mk1 History
- Pro-120 Key Components
- Modifying the Pro-120 for other voltages
- Pro-120 Modification to give Uni-Directional Control
- Pro-120 Robot Wars Version
- Pro-120 Ignition Options
- Earth Fuses: Why Do They Blow?
- Battery Discharge Protection: PRO-120
- PRO-120 Ramp Reduction
- Fitting Expansion Connector
- Internal Power Supply and Protection Circuitry
- PRO 120 Mark 1 - Additional Diagrams
- PRO-120 Mark 1
- VTX
- VTX Speed Controller
- Fitting Expansion Connector
- Positional Servo Control [DNO / VTX]
- Waveforms and Fault Finding
- Damage from Reversed Batteries (NCC/VTX)
- Internal Power Supply and Protection Circuitry
- Wiring for Push Button Use
- VTX Modification History
- VTX and NCC Operating Voltages
- VTX / NCC Fault Finding
- VTX
